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Segment Information Summary of Unconsolidated Real Estate Ventures (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Dec. 31, 2014
Segment Reporting Information [Line Items] |  |  |  |  |  |
Investment in Real Estate Ventures, at equity | $ 233,478 us-gaap_EquityMethodInvestments |  |  |  | $ 225,004 us-gaap_EquityMethodInvestments |
Equity in income of Real Estate Ventures | 131 us-gaap_IncomeLossFromEquityMethodInvestments |  | 242 us-gaap_IncomeLossFromEquityMethodInvestments |  |  |
Philadelphia CBD [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Investment in Real Estate Ventures, at equity | 29,164 us-gaap_EquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = bdn_PhiladelphiaCbdMember |  |  |  | 27,137 us-gaap_EquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = bdn_PhiladelphiaCbdMember |
Equity in income of Real Estate Ventures | (300)us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = bdn_PhiladelphiaCbdMember |  | (21)us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = bdn_PhiladelphiaCbdMember |  |  |
Pennsylvania [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Investment in Real Estate Ventures, at equity | 17,273 us-gaap_EquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = bdn_PennsylvaniaMember |  |  |  | 17,385 us-gaap_EquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = bdn_PennsylvaniaMember |
Equity in income of Real Estate Ventures | (6)us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = bdn_PennsylvaniaMember |  | 32 us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = bdn_PennsylvaniaMember |  |  |
Metropolitan Dc [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Investment in Real Estate Ventures, at equity | 78,069 us-gaap_EquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = bdn_MetropolitanDcMember |  |  |  | 73,127 us-gaap_EquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = bdn_MetropolitanDcMember |
Equity in income of Real Estate Ventures | (50)us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = bdn_MetropolitanDcMember |  | 67 us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = bdn_MetropolitanDcMember |  |  |
New Jersey/ Delaware [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Investment in Real Estate Ventures, at equity | 0 us-gaap_EquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = bdn_NewJerseyDelawareMember |  |  |  | 0 us-gaap_EquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = bdn_NewJerseyDelawareMember |
Equity in income of Real Estate Ventures | 48 us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = bdn_NewJerseyDelawareMember |  | 18 us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = bdn_NewJerseyDelawareMember |  |  |
Richmond, Virginia [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Investment in Real Estate Ventures, at equity | 1,410 us-gaap_EquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = bdn_RichmondVirginiaMember |  |  |  | 1,574 us-gaap_EquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = bdn_RichmondVirginiaMember |
Equity in income of Real Estate Ventures | 86 us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = bdn_RichmondVirginiaMember |  | (45)us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = bdn_RichmondVirginiaMember |  |  |
Austin, Texas [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Investment in Real Estate Ventures, at equity | 107,562 us-gaap_EquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = bdn_AustinTexasMember | [1] |  |  | 105,781 us-gaap_EquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = bdn_AustinTexasMember | [1]
Equity in income of Real Estate Ventures | $ 353 us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = bdn_AustinTexasMember | [1] | $ 191 us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = bdn_AustinTexasMember | [1] |  |
[1] | Investment in real estate ventures does not include the $1.2 million negative investment balance in one real estate venture as of March 31, 2015 and December 31, 2014, which is included in other liabilities.

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